Publications

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D
Dionísio, M, Ramos MJJ, Williams G.  1994.  Dielectric relaxation in poly(n-alkyl methacrylate)s and their mixtures with p-nitroaniline. polymer. 38(8):1705-1713.Website
Dionísio, M, Ramos MJJ, Gonçalves RM.  1990.  The enthalpy and entropy of cavity formation in liquids and corresponding states principle. Canadian Journal of Chemistry. 68:1937-1949.Website
Dionísio, M, Ramos MJJ, Williams G.  1993.  Dipolar relaxation behaviour in poly(methyl methacrylate)/4-nitroaniline solid solutions. Polymer International. 32:145-151.Website
Dudognon, E, Correia NT, Danède F, Descamps M.  2013.  Solid-Solid Transformation in Racemic Ibuprofen. Pharmaceutical Research. 30(1):81-89.
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Gomes, PJ, Coelho M, Dionísio M, Ribeiro PA, Raposo M.  2012.  Probing radiation damage by alternated current conductivity as a method to characterize electron hopping conduction in DNA molecules. Applied Physics Letters. 101(12):123702-1-4.Website
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Hédoux, A, Guinet Y, Derollez P, Dudognon E, Correia NT.  2011.  Raman spectroscopy of racemic ibuprofen: Evidence of molecular disorder in phase II. International Journal of Pharmaceutics. 421:42-52.
Hussain, A, Semeano ATS, Palma SICJ, Pina AS, Almeida J, Medrado BF, Pádua ACCS, Carvalho AL, Dionísio M, Li RWC, Gamboa H, Ulijn RV, Gruber J, Roque ACA.  2017.  Tunable Gas Sensing Gels by Cooperative Assembly. Advanced Functional Materials. 27(27):1700803.Website
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Kourmentza, C, Araujo D, Sevrinc C, Roma-Rodriques C, Ferreira LJ, Freitas F, Dionísio M, Baptista PV, Fernandes AR, Grandfils C, Reis MAM.  2019.  Occurrence of non-toxic bioemulsifiers during polyhydroxyalkanoate production by Pseudomonas strains valorizing crude glycerol by-product. Bioresource Technology . 281:31-40.Website
M
Mano, JF, Lanceros-Méndez S, Nunes AM, Dionísio M.  2001.  Temperature Calibration in dielectric measurements. Journal of Thermal Analysis and Calorimetry. 65:37-49.Website
Merino, EG, Rodrigues C, Viciosa TM, Melo C, Sotomayor J, Dionísio M, Correia NT.  2011.  Phase Transformations Undergone by Triton X-100 Probed by Differential Scanning Calorimetry and Dielectric Relaxation Spectroscopy. Physical Chemistry B. 12336(1):12336–12347. AbstractWebsite

The phase transformations of the surfactant Triton X-100 were investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and dielectric relaxation spectroscopy (DRS). In particular, crystallization was induced at different cooling rates comprised between 13 and 0.5 K min–1. Vitrification was detected by both DSC and DRS techniques with a glass transition temperature of 212 K (measured on heating by DSC) allowing classifying Triton X-100 as a glass former. A fully amorphous material was obtained by cooling at a rate ≥10 K min–1, while crystallization was observed for lower cooling rates. The temperature of the onset of melt-crystallization was found to be dependent on the cooling scan rate, being higher the lower was the scan rate. In subsequent heating scans, the material undergoes cold-crystallization except if cooled previously at a rate ≤1 K min–1. None of the different thermal histories led to a 100% crystalline material because always the jump typical of the glass transformation in both heat flux (DSC) and real permittivity (DRS) is observed. It was also observed that the extent/morphology of the crystalline phase depends on the degree of undercooling, with higher spherulites developing for lower undercooling degree (24 K ≤ Tm – Tcr ≤ 44 K) in melt-crystallization and a grain-like morphology emerging for Tm – Tcr ≈ 57 K either in melt- or cold-crystallization. The isothermal cold- and melt-crystallizations were monitored near above the calorimetric glass transition temperature by POM (221 K) and real-time DRS (Tcr = 219, 220, and 221 K) to evaluate the phase transformation from an amorphous to a semicrystalline material. By DRS, the α-relaxation associated with the dynamic glass transition was followed, with the observation that it depletes upon both type of crystallizations with no significant changes either in shape or in location. Kinetic parameters were obtained from the time evolution of the normalized permittivity according to a modified Avrami model taking in account the induction time. The reason the isothermal crystallization occurs to a great extent in the vicinity of the glass transition was rationalized as the simultaneous effect of (i) a high dynamic fragile behavior and (ii) the occurrence of catastrophic nucleation/crystal growth probably enabled by a preordering tendency of the surfactant molecules. This is compatible with the estimated low Avrami exponent (1.12 ≤ n ≤ 1.6), suggesting that relative short length scale motions govern the crystal growth in Triton X-100 coherent with the observation of a grainy crystallization by POM.

Merino, EG, Danéde F, Derrollez P, Dias CJ, Viciosa TM, Correia NT, Dionísio M.  2013.  Investigating the influence of morphology in the dynamical behavior of semicrystalline Triton X100: insights in the detection/nondetection of the α′-Process. The Journal of Physical Chemistry B. 17:9793-9805.Website
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Nunes, TG, Viciosa MT, N. T. Correia, F. Danède, Nunes RG, Diogo HP.  2014.  A Stable Amorphous Statin: Solid-State NMR and Dielectric Studies on Dynamic Heterogeneity of Simvastatin. Molecular Pharmaceutics. 11(3):727-737.Website
R
Ramos, MJJ, Dionísio M, Gonçalves R, Diogo H.  1988.  A further view on the calculation of the enthalpy of cavity formation in liquids. The influence of the cavity size and shape. Canadian Journal of Chemistry. 66(11):2894-2902.Website
Ramos, MJJ, Sousa CRJ, Correia NT, Dionísio M.  1996.  Molecular Motions in a Molecular Crystal: Tetrachloro-rn-Xylene. Berichte der Bunsengesellschaft für physikalische Chemie. 100(5):571-577.Website
Rodrigues, AC, Viciosa MT, F. Danède, Affouard F, N. T. Correia.  2014.  Molecular Mobility of Amorphous S-Flurbiprofen: A Dielectric Relaxation Spectroscopy Approach. Molecular Pharmaceutics. 11(1):112-130.Website
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Santos, MM, Raposo LR, Carrera GVSM, Costa A, Dionisio M, Baptista PV, Fernandes AR, Branco LC.  2019.  Ionic Liquids and Salts from Ibuprofen as Promising Innovative Formulations of an Old Drug. ChemMedChem . 14:907–911.Website
Sousa, M, Brás AR, Veiga HIM, Ferreira CF, Pinho MN, Correia NT, Dionísio M.  2010.  Dynamical Characterization of a Cellulose Acetate Polysaccharide. The Journal of Physical Chemistry B. 114:10939-10953.Website
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Teixeira, SS, Graça MPF, Dionísio M, Ilcikova M, Mosnacek J, Spitalsky Z, Krupa I, Costa LC.  2014.  Self-standing elastomeric composites based on lithium ferrites and their dielectric behavior. Journal of Applied Physics. 116:224102(1-8).Website
Teixiera, SS, Dias CJ, Dionísio M, Costa LC.  2013.  New method to analyze dielectric relaxation processes: a study on polymethacrylate series. Polymer International. 62:1744-1749.Website
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Viciosa, MT, Correia N, Sánchez SM, Ribelles GJL, Carvalho AL, Romão MJ, Dionísio M.  2009.  Real-Time Monitoring of Molecular Dynamics of Ethylene Glycol Dimethacrylate Glass Former. journal of Physical Chemistry B. 113:14209-14217.Website
Viciosa, MT, Santos G, Costa A, Danède F, Branco LC, Jordão N, Correia NT, Dionísio M.  2015.  Dipolar motions and ionic conduction in an ibuprofen derived ionic liquid. Physical Chemistry Chemical Physics. 17:24108-24120.Website
Viciosa, MT, Correia NT, Sánchez SM, Ribelles GJL, Dionísio M.  2009.  Molecular Dynamics of Ethylene Glycol Dimethacrylate Glass Former: Influence of Different Crystallization Pathways. Journal of Phyiscal Chemsitry B. 113:14196-14208.Website